In the commit:
	commit 02ec43ce74e015eed509305e4faad78c9a8f828a ("kernel:
	spec_core: Update API setup_timer() to timer_setup()")

We added the newer protoype for 'fd_update_calibration()' along-with the
older one with conditional ditrectives.

Reflect the same changes in 'fine-delay.h' to avoid compilation error.
Signed-off-by: Vaibhav Gupta <vaibhav.gupta@cern.ch>